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MC1496DG Datasheet(PDF) 8 Page  ON Semiconductor 

MC1496DG Datasheet(HTML) 8 Page  ON Semiconductor 
8 / 14 page MC1496, MC1496B http://onsemi.com 8 500 100 400 300 0 200 VC, CARRIER INPUT LEVEL (mVrms) fC = 10 MHz 0 60 50 40 30 20 10 70 2fC ± fS 2fC ± 2fS 3fC ± fS fC, CARRIER FREQUENCY (MHz) 50 10 1.0 5.0 0.05 0.1 0.5 0 60 50 40 30 20 10 70 Figure 21. Suppression of Carrier Harmonic Sidebands versus Carrier Frequency Figure 22. Carrier Suppression versus Carrier Input Level fC = 500 kHz OPERATIONS INFORMATION The MC1496, a monolithic balanced modulator circuit, is shown in Figure 23. This circuit consists of an upper quad differential amplifier driven by a standard differential amplifier with dual current sources. The output collectors are cross−coupled so that full−wave balanced multiplication of the two input voltages occurs. That is, the output signal is a constant times the product of the two input signals. Mathematical analysis of linear ac signal multiplication indicates that the output spectrum will consist of only the sum and difference of the two input frequencies. Thus, the device may be used as a balanced modulator, doubly balanced mixer, product detector, frequency doubler, and other applications requiring these particular output signal characteristics. The lower differential amplifier has its emitters connected to the package pins so that an external emitter resistance may be used. Also, external load resistors are employed at the device output. Signal Levels The upper quad differential amplifier may be operated either in a linear or a saturated mode. The lower differential amplifier is operated in a linear mode for most applications. For low−level operation at both input ports, the output signal will contain sum and difference frequency components and have an amplitude which is a function of the product of the input signal amplitudes. For high−level operation at the carrier input port and linear operation at the modulating signal port, the output signal will contain sum and difference frequency components of the modulating signal frequency and the fundamental and odd harmonics of the carrier frequency. The output amplitude will be a constant times the modulating signal amplitude. Any amplitude variations in the carrier signal will not appear in the output. The linear signal handling capabilities of a differential amplifier are well defined. With no emitter degeneration, the maximum input voltage for linear operation is approximately 25 mV peak. Since the upper differential amplifier has its emitters internally connected, this voltage applies to the carrier input port for all conditions. Since the lower differential amplifier has provisions for an external emitter resistance, its linear signal handling range may be adjusted by the user. The maximum input voltage for linear operation may be approximated from the following expression: V = (I5) (RE) volts peak. This expression may be used to compute the minimum value of RE for a given input voltage amplitude. Signal Input Carrier Input 8 (+) 500 500 500 14 VEE Bias VC (Pin numbers per G package) Vo, Output (−) 12 2 Gain Adjust 3 (+) 6 VS 10 (−) 4 (−) 1 (+) 5 −Vo Re 1.0 k 2 12 Vdc RL 3.9 k +Vo VEE −8.0 Vdc 6.8 k I5 14 0.1 mF 12 MC1496 6 8 1.0 k 1.0 k 50 k 51 10 k 10 k 0.1 mF Carrier Input Modulating Signal Input VS VC Carrier Null 51 3 51 4 1 10 5 RL 3.9 k Figure 23. Circuit Schematic Figure 24. Typical Modulator Circuit 

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